Malicious PDF — malware analysis report

Static analysis result for SHA-256 73271d70a95c972d…

MALICIOUS

PDF

77.6 KB Created: 2021-09-22 22:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 92c5e7c0014c5ddf937ae98d32991638 SHA-1: aa12b011cad2a1eb6cc16ca0115062ac62c9b8ff SHA-256: 73271d70a95c972d09b0a824eb428fbbf7f000f68d63d24261912f1c46fe5554
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. These URLs are likely intended to redirect users to phishing or malware distribution sites. The presence of embedded JavaScript, though obfuscated, suggests an attempt to automate malicious actions upon opening the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://smidgel.ru/uplcv?utm_term=fahrenheit+451+book+pdf+256+pages PDF link annotation
    • http://merrygoldholidays.com/ckfinder/userfiles/files/pejamoso.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/gupusu.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/16989925175.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/3963871f07d94a87d062c11655b718d2/xarebakipesisimugum.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140066821504---gemudo.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/58189517981.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/81685895921.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/bavarubodisuje.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/44984833836.pdfIn PDF document text
    • http://hiniceshine.com/upload/96071043028.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/gixefunokojobiguz.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/60910777625.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kbbl3gjb1enukjn8h6pfgu6f63/lidevevesat.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/81477125417.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/59403281201.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/64251865852.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/84286802953.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/mebokulexuvikuxadipi.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366586d9a54---narorijil.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/35071090622.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/lujujilodiguvusatujarabaw.pdfIn PDF document text
    • http://charivne.info/images/file/55861458136.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/98014515838.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161481640be51b---sadaviwelaluguzupabizu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6D 18168 bytes
SHA-256: 9a52dfb55ffcbe037bdf79f2fd8332885ca6e31ece5edcf4fab86cf1435bb6ab
font_02_sfnt_off00010de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE1 11492 bytes
SHA-256: f1f0488b2a5aa1ff323cdd07670e6aa42905d303f1fa34504016400382595008

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